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Răspuns :

a E(x)=(2x-3-x-1)(2x-3+x+1)=(x-4)(3x-2)
b E(-1)=(-2-3)²-(-1+1)²=(-5)²-0=25=5²
c  E(1/2)=(2*1/2-3)²-(1/2+1)²=(-2)²-(3/2)²=4-9/4=7/4
   E(-1/2)=[2*(-1/2)-3]²-[(-1/2)+1]²=(-4)²-(-3/2)²=73/4
7/4:73/4=7/73